Use of eddy is done on the following except :

Options

A. moving coil galvanometer
B. electric brakes
C. induction motor
D. dynamo

Answer

To solve the question regarding the uses of eddy currents, we will analyze each option provided and determine whether eddy currents are utilized in that application.

### Step-by-Step Solution:

1. **Understand Eddy Currents**: Eddy currents are loops of electrical current that are induced within conductors by a changing magnetic field due to Faraday's law of electromagnetic induction. They can produce significant heating effects and are used in various applications.

2. **Evaluate Each Option**:
- **Moving Coil Galvanometer**: Eddy currents are used in moving coil galvanometers to provide damping. When the coil moves in the magnetic field, eddy currents are induced in the coil, which helps to stabilize the readings. Therefore, this option uses eddy currents.

- **Electric Brakes**: Eddy currents are also utilized in electric brakes. When a conductor moves through a magnetic field, eddy currents are induced, which create a magnetic field opposing the motion, thus providing a braking effect. Hence, this option uses eddy currents.

- **Induction Motor**: Induction motors operate on the principle of electromagnetic induction, where eddy currents are generated in the rotor, allowing it to turn. Therefore, this option also uses eddy currents.

- **Dynamo**: A dynamo converts mechanical energy into electrical energy using electromagnetic induction. However, it does not primarily rely on eddy currents for its operation. Instead, it uses the principle of induced electromotive force (EMF) in a conductor moving through a magnetic field. Thus, this option does not use eddy currents.

3. **Conclusion**: Based on the evaluation, the correct answer to the question "Use of eddy is done on the following except:" is **Dynamo**.

### Final Answer:
The correct option is **Dynamo**.

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